/**
 * Healthie seemingly uses a custom format for dates.
 * Their documentation platform does not explicitly say which format is used, but based
 * on testing we've identified 'yyyy-MM-dd HH:mm:ss XX' (example: `2023-06-05 14:10:00 +0200`)
 * as the format used. This has been tested in:
 * - appointment date
 *
 * This function can be used to convert from the format used by Healthie to the format expected
 * by orchestration (ISO8601).
 */
export declare const convertDate: (dateString: string | undefined | null, formatString?: string) => string | undefined;
